Apparatus for the molding of long objects by centrifugal treatment



Oct. 20, 1931. P. FERRIER 1,828,037

APPARATUS FOR THE MOLDING 0F LONG OBJECTS BY CENTRIFUGAL TREATMENT Filed Sept. 21, 1928 2 Sheets-Sheet l 06. 20, 1931. FERRIER 1,828,037

APPARATUS FOR THE MOLDING OF LONG OBJECTS BY CENTRIFUGAL TREATMENT Filed Sept. 21, 1928 2 Sheets-Sheet 2 HQ I 4/7 y Patented 20, 1931 PATENTQO-FFIICE. i

I 01' PARIS, FRANCE arrmrus iron. man lemme or none. owners 3! cnnrnmuenn 'rnm'rmr Application fled September 21, 1928, Serial No. 807,467, and in France April 26, 1928. i

The present invention relates to an apparatus for molding, by the centrifugal rocess, long and narrow ob ects which must supported at more than two points during the 5 rotation.

The present invention has for its object a centrifugal moldin machine for molding elongated pants. e main feature of t his improved machine consists in the PIOVlSlOn 1- of a frame carrying a plurality of pairs of rollers bearin the molds through more than two oints 0 their length the rollers dison one side of the frame serving to ose drive the molds to which they imparta rotar motion.

. Ill the execution of the invention, the driving rollers are secured to a common shaft controlling them, or else they are driven independently through auxiliary control means. 9 The machine, according to the invention, shows moreover the following advantageous features:

1. The rollers are held in swivel ball bearings carried by shoes piv tally secured through-one end to the frame, the other end being secured to a suitable ylelding arrangement rovided with a damping device.

2. urthermore, a rigid cradle comprlsing two parts adapted to be rigidl bolted together is providedon its outer sur ace with a roller path or guideway adapted to move over the rollers o the frame and carries the yiel elongated molds. The ollowln description with reference to the ap ended awings which are given by way of example shows various embodiments of the present invention. Fig. 1 is an end view of the apparatus. Fig, 2 is a partial lengthwise section.

side serve as joints.

Fig. 3 is a side view of the whole machine- 6 and carrying the spaced-apart.

driving rollers. They may be mounted upon a common shaft w or may be actuated by in dependent means by suitable drivin gear, as a driving pulley m. In thesecon 'tions, if the mold provided with its wheels engagin I the rollers ff were perfectly regular, rigi and centered on the said rollers, it would rotate in a circular manner and the machine would well operate. However, in the actual circumstances, the mold which had a regular form when new, will become rapidly distorted after use, and the said wheels, whether centered or not, will form eccentrics which cause shocks upon the rollers, even if the latter have rubber tires, and the resulting shocks will cause strains on the various parts, whence a defective apparatus will result.

To obviate these defects, the bearings e of 'the rollers fare mounted on the machine by means oft e base plates .0 pivoted at one end, the other end depending upon an elastic arrangement comprising 4 a spring 01. The plates 0 are inclined in such manner that the motion of the said rollers will be practically perpendicular to the tangent at the contact, 7 in order to reduce the amount of their motion. The said parts are adjustable, and the pivoting motion of the plates 0 is reduced by the shock,absorbers g secured to the crossieces b. The bearings e are of the ball-bearmg and the ball-and-socket type, to provide for the relative motion, and the diameter of the'shaft, if it is common, is such that it will afford a suflicient flexion without danger, or otherwise it would be necessary to utilize auxiliary shafts, or a common shaft com rising several sections connected together by ardan The elasticity. thus obtained will ermit the manufacture of molded pieces o good quality with the use of molds which are irregular or are badly centered, provided they are sufficiently rigid. I

For the manufacture of tapered pieces, the molds are inclined, and are thus arrested at the end by a fixed stop; the rod of the said step is capable of pivotation in order to follow the movements of the mold, but if the latter is flexible-and also irregular, the cocentricity will become too great, and it will be necessary to increase the rigidity of the mold.

In this case I employ a counter-mold or cradle n carrying the removable spacing pieces 0 of the mold p, which provides for the insertion of different molds and for their centering, the inertia of the said cradle being greater than that of the mold. The peripheral part of the said cradle is thus supported 'by the wheels 9 suitably spaced thereon.

When provided witha counter-mold, the said machine comprises a device by which the latter may be closed. For this purpose I place at suitable points on the cradle 10., the rotating catches 7' controlled by the rod 8 actuated b hydraulic presses, t for the closing and u or the opening, to which the water under pressure is supplied by a flexible hose with a quick coupling device.

The rotating catches 1' cannot bring the two halves of the counter-mold together; the I said halves are brought together by the auxiliary hydraulic presses disposed along the machine and supplied by the hose m.

The closing presses k are mounted on an arm and are actuated by a shaft h subjected to a ydraulic control 71. 1

A slidin member 1 allows the press It to automatica ly regulate itself to the proper height for the closing of the said cradle, according to the downward motion of the elastic supporting system consisting of the plates 0 and the sprlngs d.

The end of the said cradle is provided with a flange 'v and is in contact with one or more thrust rollers y which limit its motion and whose height is adjustable upon an auxlhary frame or support mounted on the main frame.

The construction of the apparatus as above specified corresponds to a certain number of results thereby obtained, which form the characteristic features of the operation of the machine, as follows:

A mold which is accurately centered and is held rigidly in the straight position when in rotation.

A molded piece which is also well centered and has a regular thickness, even in a mold which is flexible and not very straight.

A rigid apparatus whose speed of rotation can be increased without danger of attaining the critical speed of the whipping of the mold.

In this case the centrifugal motion will have its maximum effect due to the speed employed.

Since the said cradle is an apparatus adapted for a purely mechanical functioning,

which is discharged from the mold, whence the cost of maintenance will be reduced. The interior of the said cradle contains no mechanical parts, and can thus be readil cleaned and lubricated so as to prevent a adhesion.

For the molding of ta ered pieces, the whole machine may be inc ined towards the point, and the flange which is pressed against the said rollers will also prevent the splashin of the liquid.

he entire machine can be utilized not only for the centrifugal treatment of concrete but also for the like treatment of long pieces of metal molded: by centrifugal action, with dead molds or not.

Obviously, the said arrangements are given solely by way of example, and the forms, material and dimensions of the several parts as well as the details are susceptible of various modifications without departing from the spirit of the invention.

I claim:

1. A centrifugal molding machine for moldingelon'gated parts comprising a frame provided with several pairs of yieldingl mounted rollers carrying the molds throu h more than two points of their length, t e rollers disposed on one side on the frame being driving rollers and imparting a rotary motion to the molds.

2. A centrifugal molding machine according to claim l wherein the driving rollers are borne by a common shaft and are caused to rotate through this shaft.

3. A centrlfu a1 moldin machine according to claim I w erein the riving rollers are secured to independent shafts and are actuated through auxiliary transmissions which are also in ependent.

4. A centrifugal molding machine according to claim 1 wherein the rollers are carried in swivel ball bearings, supported by shoes the frame to receive the long and yielding molds. I

In testimony whereof I aflix my signature.

' PAUL FERRIER.

of water containing more or less cement, 

